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One of the most basic fire weapons is the gun powder cannon. Its most basic piece is a metal tube with an end cap firing a metal projectile burning gunpowder. This weapon is used since the Middle Ages, when great battles to occupy a territory took place. Since ancient times, gunpowder guns have evolved and improved. Cannon were derived as the other mortar or howitzer, which are guns that shoot with elliptical trajectory. Ancient galleys and large ships (such as pirates) were equipped with these guns.